<style type="text/css">
    .content-body{
        position: relative;
        top: 40px;
        margin-left: 5%;
        width: 89%;
        height: 480px;

    }
    .row7-input{
        width: 200px;
        height: 44px;
        background-color: #000;
        color: #fff;
        font-size: 20px;
        margin-left: 40px;
        border-style: none;
        border-radius: 3px;
        margin-top: 20px;;
    }
</style>

<ul class="nav nav-tabs">
    <li class="active"><a href="#year1" data-toggle="tab">第一年度</a></li>
    <li><a href="#year2" data-toggle="tab">第二年度</a></li>
    <li><a href="#year3" data-toggle="tab">第三年度</a></li>
</ul>

<div class="tab-content">
    <div id="year1" class="tab-pane fade in active content-body" >
        <div>
            <input type="button" value="生成第一年回报" class="row7-input" id="btnSave1">
        </div>
    </div>
    <div id="year2" class="tab-pane fade content-body" >
        <div>
            <input type="button" value="生成第二年回报" class="row7-input" id="btnSave2">
        </div>
    </div>
    <div id="year3" class="tab-pane fade content-body" >
        <div>
            <input type="button" value="生成第三年回报" class="row7-input" id="btnSave3">
        </div>
    </div>
</div>